@article{59271,
      author = {Ditmars, Raymond Lee,},
      url = {http://library.usi.edu/record/59271},
      title = {A field book of North American snakes.},
      publisher = {Doubleday, Doran & company, inc.,},
      recid = {59271},
      pages = {305 p. ;},
      address = {New York,},
      year = {1939},
}